ML20012G539
| ML20012G539 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/23/1993 |
| From: | DUQUESNE LIGHT CO. |
| To: | |
| Shared Package | |
| ML20012G538 | List: |
| References | |
| NUDOCS 9303090021 | |
| Download: ML20012G539 (2) | |
Text
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4.5.3 Eccentric Fuel Positionina t
The fuel assembly is assumed to be normally located in the center j
of the storage rack cell.
Calculations were also made with the fuel assemblies assumed to be in the corner of the storage rack cell (four-asse.aly cluster at closest approach).
These calculations indicated
- that, in Region 1,
the reactivity is slightly lower for the eccentric fuel position than for the l
reference centered position.
i i
4.6 Recion 2 Criticality Analyses a
4.6.1 Nominal Desian Case 1
The principal method of analysis in Region 2 was the CASMO-3 code, using the restart option in CASMO-3 to analytically transfer fuel i
of a
specified burnup into the storage rack configuration at a j
reference temperature of 4"C (39*F).
Calculations were made for fuel of several different initial enrichments
- and, at each enrichment, a
limiting k-infinity value was established which includes additional factors for the uncertainty in the burnup analyses and for the axial burnup distribution.
The restart l
CASMO-3 calculations (cold, no-Xenon, rack geometry) were then interpolated to define the burnup value yielding the limiting k-infinity value for each enrichment, as indicated in Table 4.4.1.
These converged burnup values define the boundary of the acceptable domain shown in Figure 4.2.1.
Burnup values calculated with the polynomial function given below are shown in Table 4.4.1 and on Figure 4.2.1.
4-13 9303090021 930223
- orrected February 17, 1993)
PDR ADDCK 05000334 P
9 l
l Table 4.2.2 REACTIVITY EFFECTS OF ABNORMAL AND ACCIDENT CONDITIONS Accident / Abnormal Conditions Reactivity Effect Temperature increase Negative (Table 4.7.1)
Void (boiling)
Negative (Table 4.7.1)
Assembly dropped on top of rack Negligible
(<0.0001 AK)
Lateral rack module movement Negligible
(<0.0001 AK)
Misplacement of a fuel assembly Positive (control by soluble boron) i l
4-22 (Corrected February 17, 1993)